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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e84c9607f00529bd53f51d3b937f00e39cd8995373339d99bd317c9e339b492' 
  AND token = 'jFZkQ89GNY4vxNWhiKgPOY5HavzO2bWmO6qcThKGgk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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