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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a4a478744a3f46c9a3167160303e4ed33a769f17c64fb53b37a39656a53c51' 
  AND token = 'embFIxkc43P10Cp7AXj+mEU769Wddcc4S1Tr3ur/G+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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