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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c701806371760b89fce2b3b38c2dbf0ac18e692fe9b0a74d3192a70239ee8f52' 
  AND token = 'gII82Vb1GmBgowo9PA1AP5naz4rDbusOeZ+bhdwQSeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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