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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3d57ee4baf53a8cbc63788e95161f5a0177ffb3eff2b38e4fe2c45803abdb7' 
  AND token = 'an0rB2eWDqqpAUyonPJkyT5TgI4xsXYdLiNJISLdVbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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