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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8847526e7aedc1ffb5874d449fe5f17af2a01140caab9d826a312d78f65ea2d' 
  AND token = '39Uq7iJudoiGngrBp1wZlwbiAnYpA12bmlZaTobaKOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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