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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8924699f09e76a0863c644f86c8b748376c2ff106af961ca4041cadd032449bf' 
  AND token = 'WH0KvnJ5DuTNeCSriL9h7h8zwpNboYZVZtuC/X6JHts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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