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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6999a61f54f2ae6b0dc39ec5d9112ed4856017a8408bcfa5d2a62c80f55957a2' 
  AND token = 'DM+aUoP7aqwCGYNM4pJXbxMDB5hV8o3RlChmtyMGFDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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