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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ef0c0066ad1a660075cf5d7ec1b5493da5af203ee8ce3c5f00f86ce0084cb5' 
  AND token = 'ZzfmYCnSy2bmrqgj6dONC19W6hW163Edqbae2VCheSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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