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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93c4ffc751543e250f658020e57cf09ec02f39fe1af1487e565b0330f1e2eee' 
  AND token = 'NqD2/oAmYFBds0cufPzs4wihmiqwEMpvn6xSkQIsnME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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