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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90032370ddc12b53c03127e354480b55b4bba07ef95603c04e47508096dc6d65' 
  AND token = 'yD7FUi7sZcU9dkKAcBFyylzRrhn8TgTeIusZfe48wG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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