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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb598b48a47245bd1a9ac9bd9b58b6d09ec13ca84a2cdbb57108c5116a7ffd9' 
  AND token = '3o1gMRN1eBiL45c+m1eNDs3J7oiJM8LQ7YUSKDW4EJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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