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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebfd685dc65bf842c4e4cff59e9d617c4ee9eb18acb2515c313f66861108b5b0' 
  AND token = 'fu3fKjYFVyGCFZB5WzWJEno4DAzIfAOV8IPcmYmcub4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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