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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b558f7b3262be30c52ed106930c88c71afb99f617bd525c90d103b71a94d78e' 
  AND token = '07zGtKHsu+SwRakIZcHPaxD75S9T3saftsO7a5mOoZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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