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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f0e0b46d8274a257aed1a822cac538449c936fc1214dbe354aa1226ac47e02' 
  AND token = 'wLwTbpETp7S4DgDK8+ywkK15JwGl/sQ8c5McQtkG1co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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