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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa8a5cbe15fcb972eba94811c5c81a0027a24e26155b38e53c580025ec958b8' 
  AND token = 'ICLjFWa/NDBQ5Bw4BWZU3x6+aUz2x8/+nbdZMrM76E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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