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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ba16e52d35cdb3aea2861ae8089f7d7f35c65f6c3b1d8b1d3aad1fbfd70f4d' 
  AND token = 'mwDbGr3VUvcdLB+lsuXCcm6JcuPAAqm153zW2GJqUSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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