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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964f6f56a5d19d53ec8f6af4d8f493a707df3c5df2e327eadfcf382aaa78fea9' 
  AND token = 'LjQdlLRe0EW25S9wEkYvzZVX1OGmpfZjQymQ8800Te0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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