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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e0db20440f15d150171ecee5dbb97e0ff7ad950091f7232b9af2e2b883a73d' 
  AND token = 'iDNEqhPrPdUaBEigVGPPgVoC0lmzMB8YUm29l11i8Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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