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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7302d3f29c40462db9dd1dc2be92c1807a29095f6061839b907c3ee855a765fb' 
  AND token = '0CgXF3rZKrX3mv0Z7KxD9Uzc3uaUgaO/pgDWrEQ/ocQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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