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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd8c22c479aaa096be850574b8519206982b2c5d0b77b2c35b603cf4ef52e3d' 
  AND token = 'yreIloGPwxxJpsM4u7Ly7wsbGtK6eBt62ZNHM45D01w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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