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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b918503e15348aad420cef50916e91c07031fd21ae1a3f5922e586921d76d7a' 
  AND token = '3VwbWX3V+/UIwt1wNl8Nebv+YH9e6ZjzIZRkBINxBXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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