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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f5e93823a6035c2de5a4d48463014912f8cd8869514b528f67e885d5601c2a' 
  AND token = 'kM4+YdDcJduYgHe54QcEGp7QhyQeXo0rYdz3i+z1k60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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