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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c6fb74bf19a2df060ecd24f98af58b9ceac4b71206c0a854ec45c02dc7d43d' 
  AND token = '50f46Qdk4z5sidKIm5Qu0G9TlnkMLaLunmljZN9myYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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