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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d0119b6f05cf1093c20fd118a5fd0817a6f31bb549a90abe6253591b424ba73' 
  AND token = '1igm9ykXpdLVykwqN+z5r9CpaAccGRWc1iQL/XkuE60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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