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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5fe1ee46a2e7cfa259c70ccaa0d2d32da5b9c1a759ec865cd0f718b2685f838' 
  AND token = 'Yh0/eq3M+FAc7yzrGBfX8bqH3SfLgCpIrlk7lN85qnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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