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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53399acbd04502cc77b352113177ff2617e6e716564bf1769cc78835d6bfdf45' 
  AND token = 'wBgEasnLnZfEuMv9SaT9+hwSNKc5J6OMl+Z33i7Cm7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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