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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831b51313dfeced2bbec224a2d063668a13bc2108545bc20c335be46ae85c773' 
  AND token = '3ag2GYF31IIsqW0K6xnD0gPiaPzoUIYh662r37l2elk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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