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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2047402f9195129856d0bcfabce8641c526f3d1d74c4c3346f40bdf3d658a4b0' 
  AND token = 'X71NwkAvLGY1dXpggLoEAQPCwKviAFjOg2EL4QH8tPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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