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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810b7d9404b799aa49508e7aafb2b80acad9a9d61e9b1df71affadb5fc159a27' 
  AND token = 'a/rdPRfiFEdlBHj1xn7+T4G9wJfVMGcW1rITUAoddbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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