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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b6ff0383b98f5ce03bb4ffa4597876a866ae925ae0dd1f3a4dadfc551329013' 
  AND token = 'ynv7bQp0+58nNUojuuSWa5QujocFKQGHvk9/jzyr3Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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