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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99d6109212d8318051a03c9c2a78ef1c49c6a5a3c35dd940867387096c23a93' 
  AND token = 'lPS7+W7beADCWwKqP2WZ9Wp2ll93T7EyyLyF3TQL5t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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