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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35186decaa441ae0ff2de8c6e970ecf8e113ca4ecfab3ef0fe32f714f2413226' 
  AND token = 'D8J96f4NKZ8JUbFueXPt843b82+8uN5t5WRb1LrLKYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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