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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f67d20749cedf7264a5c13cd64272f5704c6ce25e8f19ad2696ec06c993001' 
  AND token = 'soJXnn84d1QZbxsVreF8oFfNVpg+8pwzfSgPiPL+ewg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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