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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2a84e5990f669feba4a0d86acda56c985d8d37d9eff4d3e4f0d22a7e2154d8' 
  AND token = 'RhpgbNxFAE4x0gr4FTbfXxAvXbttAApIvQutkXJJ04Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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