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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d3f5b718f084775c1fb0bd402493532e7da21dec3093e7bf4369d0cfa1ee19' 
  AND token = 'ITfMuufH82sF4VaBf3MT0V1p0uuJYnmda1VQ8jqrJMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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