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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf534f2cce65ed7b6ef78ad7b3a4cdf157a5746c4d5570fe4157648c64a83c67' 
  AND token = 'l+sN2tG2c9t7eQhQ4W2zYba8uVYajDSRt688CUIN8LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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