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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79fbb825d7e85cb66c5e685e4c02299e8b92af26383ad42612d8039c8d6b9e0' 
  AND token = 'Cb+RJy/tXcq8C3ld9mOSzPmrcgtWycavn4LMuaJr+N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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