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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2656575b2f3bf8b23c0da0665fbd3b27d632d851586f3366e124594dbd34a678' 
  AND token = 'JkeHYG+DaC9MRpcRS7c/yT9ilD/NY2dgwjyGQa+2aHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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