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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5eecffb587d0e53ab5498d2abfb72500b619c486335bd199f09b5080211c6cb' 
  AND token = '+S1lnBlF7vpjBcguCuAMVb5YImPFJDWnLRG40rPL9f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}