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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0554610ace5b7abc4e0b15abbc335bc44c07b15d6f37782b9df0b0a7ef39b60e' 
  AND token = 'bKIRODPZFyXDKIRtXylHOBkc584S94pN6K5CtBMJeAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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