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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42a58064341f2f95f76e7c3cebac77a02b7752c965c6d5011e541232e093fd6c' 
  AND token = 'OObsc9psVpuJDd9+/Hh2DT9pQr3a6hNWiP/K3GjWtV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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